Creating a 3D Printed Heart Charm in Blender

I am working on a project to make earrings, and I wanted to add a heart in the middle of of each earring where it’s connected via a jump ring to the element above and below it.  This meant adding a ring at the top and bottom of the heart.

I’m using Blender to model the earrings, and it turned out to be surprisingly hard to get it so the heart would print right.  Even though it looked fine in Blender, viewed properly in Slic3r, it still ended up printing wrong from the generated g-code.  The ring, even though it was unioned with the heart in Blender would end up looking like it had been intersected, resulting in a gap in the heart, or it would end up filling the interior of the ring, which was not what I wanted either:

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